1.

\[\frac{d}{dx}\left[ {{\tan }^{-1}}\sqrt{\frac{1-\cos x}{1+\cos x}} \right]=\] [BIT Ranchi 1989; Roorkee 1989; RPET 1996]

A.            \[-\frac{1}{2}\]
B.            0
C.            \[\frac{1}{2}\]
D.            1
Answer» D.            1


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